This is known as a path traversal attack. The following example demonstrates how to check for malicious file paths and provides a safe way to unzip. The following example uses the ZipArchive class to access an existing. The new file gets compressed when you add it to the existing zip. They use the same compression algorithm.
You can decompress GZipStream objects that are written to a. The following example shows how to compress and decompress a directory of files by using the GZipStream class:. Skip to main content. Yes, it is possible to read and write zip files, using the classes in the. NET Framework. You can do it with the System. ZipPackage class, added in. NET v3. Actually this class lets you create a package file, which is a zipfile with a particular internal structure. It includes a manifest and some other things.
But the interface is odd and confusing if all you want is a regular-old ZIP file. Also, the classes in this namespace do not provide control for things like passwords, comments, AES encryption, ZIP64, Unicode, and so on. You can also create and read zip files with the J runtime. This also has its drawbacks. First, J is going out of support, or may be out of support now.
Second, the J runtime is huge, and you have to swallow the whole thing, even if all you want is zip file capability. Also, the J runtime is based on the java. The runtime hasn't been updated in years and still includes bugs in zip file handling. It is not accessible from COM. Finally, the zip classes in the J runtime are decidedly un-dotnet. There's no support for events, or enumerators to let you do things like For Each in VB, or foreach in C.
The interface is clunky. It does not feel like a. NET class library, because it isn't a. NET class library.
So for all those reasons, J isn't ideal. This works in a limited fashion. The drawbacks here: it isn't documented. It isn't a very intuitive or powerful programming interface. There are no events, so embedding it into a Winforms app with a progress bar would be difficult. Also, the shell In fact in some cases, calling into this DLL to perform a ZIP extraction can display a dialog box, so it may not be suitable for use within server or "headless" applications.
There are other libraries out there than do zip files for. But there are compromises with each one. Some are commercial and expensive. Some are slow. Some are complicated to use.
Some of these options lack features. Some of them have more than one of these drawbacks. DotNetZip provides another option. It's a very simple-to-use class library that provides good ZIP file support. Using this library, you can write. The library also supports self-extracting archives. It is well documented and provides good performance. Though DotNetZip is implemented in.
There is a version of this library available for the. NET Compact Framework, too. I have not tested DotNetZip for use with Mono, but I've heard reports that people use the binary releases with Mono successfully, without change.
This software is open source. It is released under the Microsoft Public License of October The use of the "Microsoft Public License" does not mean it is licensed by Microsoft. See the License. It is packaged as a DLL that your application must reference: Ionic. In the "developer's kit" package, there is documentation, code examples, and debug versions of the DLL. The ZIP library depends on a set of supporting classes for doing compression and decompression; these are exposed in other namespaces.
Likewise, if you want to do BZIP2 compression, outside the scope of a zip file, you can use the Ionic. For each DLL, there is a version for the regular. DotNetZip also includes command-line and GUI tools for manipulating zip files; these can be helpful to developers when building applications that create or manipulate zip files.
They also can be helpful as end-user tools. There are other downloads for DotNetZip - the source package, the runtime-only package DLLs and no helpfile or tools , the documentation-only package, etc. There are many other examples available: some are included in the source package, some in the class reference documentation in the help file, and others on the web. Those examples provide many illustrate how to read and write zip files, taking advantage of all the various features of zip files exposed by the library.
For a full set of examples, your best bet is to see the documentation. Here's a basic primer:. The main type you will use to fiddle with zip files is the ZipFile class. Full name: Ionic. You use this to create, read, or update zip files. There is also a ZipOutputStream class, which offers a Stream metaphor, for those who want it. You should choose one or the other for your application. ExtractAll End Using. Extract Next End Using.
Notice that a using clause is always employed. DOn't forget this. Don't leave it off. If you don't understand what it is, don't just skip it. It's important. There are a number of other options for using the class library. For example, you can read zip archives from streams, or you can create write zip archives to streams, or you can extract into streams. You can apply passwords for weak encryption.
You can specify a code page for the filenames and metadata of entries in an archive. You can rename entries in archives, and you can add or remove entries from archives. You can set up save and read progress events. Check the documentation for complete information, or use Visual Studio's intellisense to explore some of the properties and methods on the ZipFile class.
This article is just way too incomplete for what we expect on CodeProject. SureshKuParser Error. When you try to include another zip file into your zip file. Morris Bahrami. I don't think DotNetZip was designed to handle zip files within zip files but you can ask the developers of that package to make sure. My article was just a simple example of how to use that package. Zip count Pramod Kamath Sep Pramod Kamath. Sir please could you tell me how to count the number of files in zip file in windows form application.
NET version 3. Re: Zip count Morris Bahrami Sep You have to unzip the file first and then enumerate the files within. Could you please advise what I am doing wrong? Shutting down CodePlex Brian. Historically our Team Explorer installer has been available for Brian Harry April 5, TFS This will likely be the last release in the TFS line.
TFS shipped almost 6 months ago and we are already hard at Brian Harry April 12,
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